Novel dibenzocycloheptenes

ABSTRACT

Racemates and optically active isomers of a compound selected from the group consisting of a compound of the formula   WHEREIN R is selected from the group consisting of hydrogen, lower alkyl optionally substituted with a member of the group consisting of hydroxy and halogen, lower alkenyl, lower alkynyl, -(CH2)n - COCH3 where n is 0 or 1,   wherein X is selected from the group consisting of lower alkyl and optionally substituted phenyl, aralkyl of seven to eight carbon atoms, acyl of an organic carboxylic acid of one to six carbon atoms optionally substituted with   where m is an integer from 0 to 6 and X1 is selected from the group consisting of hydrogen and lower alkyl,   where p is an integer from 1 to 6 and X1 is as before and   wherein X2 is lower alkyl and R1 and R2 are individually selected from the group consisting of hydrogen, halogen, lower alkyl, lower alkoxy, trifluoromethyl and dilower alkylamino and the non-toxic, pharmaceutically acceptable acid addition and quaternary ammonium salts thereof which have a stimulating effect on the central nervous system while possessing at the same time anticonvulsant activity and their preparation.

United States Patent [191 Nedelec et al.

[ NOVEL DIBENZOCYCLOHEPTENES [75] Inventors: Lucien Nedelec, Le Raincy; Daniel Frechet, Paris, both of France [73] Assignee: Roussel Uclaf, Paris, France [22] Filed: Jan. 30, 1973 [21] Appl. No.: 328,006

[30] Foreign Application Priority Data Feb. 4, 1972 France 72.03778 [52] [1.8. CI...... 260/289 C; 260/283 R; 260/286 R;

OTHER PUBLICATIONS Burger, Medicinal Chemistry, 1960, pp. 42, 497.

Primary ExaminerDonald G. Daus Assistant Examiner-David E. Wheeler Attorney, Agent, or Firm-I-Iammond & Littell [57] ABSTRACT Racemates and optically active isomers of a compound selected from the group consisting of a compound of the formula wherein R is selected from the group consisting of hydrogen, lower alkyl optionally substituted with a mem- 1 July 1,1975

ber of the group consisting of hydroxy and halogen, lower alkenyl, lower alkynyl, -(CH COCl-l where n is O or 1,

wherein X is selected from the group consisting of lower alkyl and optionally substituted phenyl, aralkyl of seven to eight carbon atoms, acyl of an organic carboxylic acid of one to six carbon atoms optionally substituted with where m is an integer from 0 to 6 and X is selected from the group consisting of hydrogen and lower alkyl,

where p is an integer from 1 to 6 and X is as before and wherein X is lower alkyl and R and R are individually selected from the group consisting of hydrogen, halogen, lower alkyl, lower alkoxy, trifluoromethyl and dilower alkylamino and the non-toxic, pharmaceutically acceptable acid addition and quaternary ammonium salts thereof which have a stimulating effect on the central nervous system while possessing at the same time anticonvulsant activity and their preparation.

7 Claims, No Drawings NOVEL DIBENZOCYCLOHEPTENES OBJECTS OF THE INVENTION I It is an object of the invention to provide the novel 5,10-imino-dibenzo-cycloheptenes of formula I and its acid addition salts and quaternary ammonium salts thereof.

It is another object of the invention to provide a novel process for the preparation of the dibenzocycloheptenes of formula I,

It is a further object of the invention to provide novel compositions for stimulating the central nervous system.

It is an additional object of the invention to provide a novel method of stimulating the central nervous system of warm-blooded animals.

These and other objects and advantages of the invention will become obvious from the following detailed description.

THE INVENTION The novel products of the invention are selected from the group consisting of racematesand optically active isomers of a compound selected from the group consisting of a compound of the formula I wherein X is selected from the group consisting of lower alkyl and optionally substituted phenyl, aralkyl of seven to eight carbon atoms, acyl of an organic carboxylic acid of one to six carbon atoms optionally substituted with where m is an integer from mo and X, is selected from the group consisting of hydrogen and lower alkyl,

where p is an integer from I to 6 and X is as before and 2 wherein X is lower alkyl and R and R are individually selected from the group consisting of hydrogen, halogen, lower alkyl, lower alkoxy, trifluoromethyl and dilower alkylamino and the non-toxic, pharmaceutically acceptable acid addition and quaternary ammonium salts thereof.

The term lower alkyl is meant alkyl of one to six carbon atoms and lower alkenyl and lower alkynyl are those containing two to six carbon atoms and may be optionally substituted with halogen.

Examples of suitable acids .for the non-toxic, pharmaceutically acceptable acid addition salts are mineral acids such as hydrochloric acid. sulfuric acid and organic acids, preferably of low molecular weight, such as acetic acid, propionic acid, fumaric acid, tartaric acid and benzilic acid. The quaternary ammonium salts are obtained by alkylationwith a lower alkyl ester or a lower alkyl halide.

Among the preferred compounds of the invention are those where R is hydrogen. methyl. ethyl, n-propyl or hydroxyethyl and especially 10,1 l-dihydro-5,l()imino- [5H]-dibenzo (a,d) cycloheptene, l2-methyl-l0 l ldihydro-S,l0-imino-[5H1-dibenzo (a,d) cycloheptene and l2-n-propyl-l0,l l-dihydro-S, lO-imino-[5H1- dibenzo (a,d) cycloheptene and their acid addition salts.

The process of the invention for the preparation of a dibenzocycloheptene of the formula wherein R and R have the above definition and R is selected from the group consisting of hydrogen, lower alkyl optionally substituted with hydroxy, lower alkenyl, lower alkynyl, (CH COCH where n is O or where X is lower alkyl or optionally substituted phenyl, aralkyl of seven to eight carbon atoms, acyl or an organic carboxylic acid of one to six carbon atoms,

where p is l to 6 and X is selected from the group consisting of hydrogen and lower alkyl and where X is lower alkyl comprises reacting with a reducing agent a compound of the formula wherein R, and R have the above definition and R" is selected from the group consisting of hydrogen, lower alkyl optionally substituted with hydroxy, aralkyl of seven 'to eight carbon atoms and H N Xl where X and 1; have the above definitions to form a compound of formula la where R is other than hydrogen which can be salified with a mineral or organic acid or resolved with a resolution agent or where R is other than hydrogen, reacted with a lower alkyl ester or a lower alkyl halide to form a quaternary ammonium salt or when R is hydrogen, reacted with an organic acid anhydride or a compound of the formula Rl -lal where R is other than hydrogen and Hal is a halogen to obtain a compound of formula la where R is other than hydrogen, which can be salified, resolved or transformed into a quaternary ammonium salt as before.

In a preferred mode of the invention, the reducing agent is hydrazine hydrate in the presence of an alkali metal hydroxide in the Wolff-Kishner method; but an alkali metal mixed hydride in the presence of aluminum chloride may also be used or the starting ketone may be changed to the ethylene thioketal and reduced with.

hydrogen in the presence of Raney nickel.

In a variation of the process of the invention, a compound of the formula wherein R R m and X have the above definition is formed by reacting a compound of the formula with a halide of the formula wherein Hal is bromine or chlorine to form a compound of the formula and reacting the latter with ammonia or a primary or secondary amine of the formula compound of the formula 'i 2 l 1 V ////J wherein R and R have the above definition and z is selected from the group consisting of COAlK.

CN and -CH l| lCOO-C H NH-COOC H wherein AlK is lower alkyl which is hydrolyzed in acid or alkalin e' media to the compound of formula la in which R is hydrogen. Preferably, the alkyl chloroformate is ethyl chloroformate and the hydrolysis of Z is effected in a basic media such as in the presence of an alkali metal hydroxide.

Another mode of the process of the invention for the preparation of acompound of the formula wherein R and R have the above definition and R' is selected from the group consisting of halo lower alkyl (cz flft fi Xl wherein X and p have the foregoing definition comprises reacting a compound of the formula with a halogenating} ag e ntj'to fofrn a compound of the formula i v XIII wherein Hal is a halogen'and eitheri r eacting the latter with anuacid'to form'theacid'addition salt thereoflresolving the latter'with a resolution agent or transforming the latter into a quaternary ammonium saltwith a lower alkyl ester or a lower alkyl halide orreacting the compound of formula'VIlwith anamine of the formula v I x P v.

. v XI] to obtain a compound the formula 40 5 v? II which as before may belconvertedi into the acidraddition salt or quaternary. ammoniumv-salt' or resolved. Preferably, the halogenat-iorr agent is ,thibn-ylchloride, sulfuryl tch'loride,-voxalyl ;chlor ide,..phos"phorus pentachloride, phosphorus trichloride,.y'phosph'o'rusoxychlo- 55. ride and methanesulfonyl"chloride;

' Ina variant of the proces'sfof theinvention for'pro-- ducing a compound of-for mula Ic wherein lRf 'is ma i,

andvx s are hydrogen, the'compoundof forniula VII is reacted with potassium phthali ide to form a com pound of the formula izwhich is then reacted with hydrazine to obtain the desired product. 1

" The starting materials of formula ll wherein R" is hydrogen can be obtained by the following process of reacting a dione of the formula l i i I R1:

reacting the latter with a mixed alkali metal hydride to form a compound of the formula and oxidizing the latter with an oxidation agent to form the desired compound. The compound of formula Xll can also be formed directly from the compound of fori mula X'by reaction with ammonia at low temperatures.

7 The process' of the invention for the preparation of a compound of formula II wherein R" is other than hydrogen comprises reacting a compound of the formula 7 with bromine to form the corresponding 5,10-dibromo compound which may then be reacted with an amine of the formula H NR" to form the desired compound.

The novel compositions for the stimulation of the 5 central nervous system are comprised of an effective amount of at least one compound of formula 1 and their non-toxic, pharmaceutically acceptable acid addition and quaternary ammonium salts and a pharmaceutical carrier. The compositions may be in the form of injectable solutions or suspensions in the form of ampoules or multiple dose flacons or in the form of tablets, coated tablets, gelules, syrups, emulsions or suppositoires prepared in the usual manner.

The compositions are useful due their psychotonic effects for the treatment of depressive states, anxiety and emotional psychosis and for the treatment of symptoms of Parkinson disease.

The method of the invention for the stimulation of 'central nervous system of warm-blooded animals com- EXAMPLE 1 10,1 l-dihydro-S,10-imino-[5H]-dibenzo (a,d)

cycloheptene dl STEP A:-hydroxy-10,l 1-dihydro-5,10-imino-[5H]- dibenzo (a,d) cycloheptene-1 l-one dl and 10-amino- 10,1 l-dihydro-5,10-imino [5H]dibenzo (a,d) cycloheptene-1 l-one dl 1 8 g of 5-bromo-l0,l 1-dihydro-[.5H]-dibenzo (a,d)-

cycloheptene-10,1 l-dione [prepared by process of Rigaudy at al, CR. Acad. Sci., Vol. 246 1958), p. 619] were added to 200 ml of ammonia at 40C and the mixture was stirred at 40C for 1 hour. The ammonia was distilled and the residue was taken up in '150 ml of methylene chloride. The solution was filtered and the filtrate was evaporated to dryness under reduced pressure. The oily residue was chromatographed over silica and was eluted with a 9-1 ethyl acetate-methanol mixture to obtain the lO-hydroxy derivative with a yield of 60% and the 10-amino derivative with a yield of 40%.

Crystallization of the l0- hydroxy derivative from ethyl acetate gave pure lOhydroxy-l0,l l-dihydro-5,10-

imino-[SHl-dibenzo (a,d) cycloheptene-1 l-one d1 melting at 214C. 7

Analysis: C,,-,H ,NO; molecular weight 237.25

Calculated: Found:

[5H]-dibenzo (a,d) cycloheptene-l l-one dl melting at 171C.

Analysis: C H N O; molecular weight 236.26

Calculated:

%N 11.86 Found: 11.7

STEP B: 11-hydroxy-l0,11-dihydro-5,10-imino-[SHldibenzo (a,d) cycloheptene d1 cis 8 g of lO-hydroxy-l0,1'1-dihydro-5.lO-imino-[SHJ- dibenzo (a,d) cycloheptene-1 l-one d1 were added at 10C to 400 ml of dioxane containing 16 g of lithium aluminum hydride and the mixture was refluxed for 3 days. 8 g of lithium aluminum hydride were added thereto and the mixture was refluxed for another 48 hours and after cooling, 700 ml of tetrahydrofuran, 150 m1 of isopropanol, 50 ml of water and then 250ml of concentrated hydrochloric acid were added thereto. The tetrahydrofuran and the dioxane were distilled off and 1,000 m1 of methylene chloride containing 20% methanol were added thereto. The mixture was made alkaline with sodium hydroxide addition and was extracted with methylene chloride containing 20% methanol. The extracts were washed with water, dried over magnesium sulfate and concentrated to dryness. The oil residue was dissolved in methylene chloride and the solution was washed 'with 2N hydrochloric acid. The combined acid wash waters were made alkaline with sodium hydroxide and extracted twice with ether.The ether solution was washed with water, dried over magnesium sulfate and concentrated to dryness under reduced pressure. The residue was chromatographed over silica gel and was eluted with a 92.5-7.5 chloroform-methanol mixture. Crystallization from methylene chloride gave 1 1-hydroxy-10,1 1-dihydro-5,10- imino-[SHLdibenzo (a,d) cycloheptene d1 cis melting at 200 and then 210C. Analysis: C H NO; molecular weight 223.26

STEP C: 10,1 1-dihydro-5,10-imino-[SH]-dibenzo(a,d-

)cycloheptene-l l-one d1 2.7 g of active manganese dioxide were added to a suspension of 5.4 g of the product of Step B in ml of chloroform and the mixture was stirred at room temperature. After 7 hours and after 15 hours of contact, each time 2.7 g of manganese dioxide were added thereto. The mixture was stirred for 96 hours and the precipitate formed was recovered by filtration, was washed three times with 2N hydrochloric acid and then water. The acid aqueous phase was' made alkaline with sodium hydroxide and was then extracted with ether. The ether phase was washed with water, then dried and evaporated to dryness. The residue, was chromatographed over silica gel and eluted with a 9-1 chloro form-methanol mixture. The product was crystallized from ether to obtain 10,1l-dihydro-S,IO-imino-[SHI- dibenzo (a,d) cycloheptene-1 l-one d1. STEP D: 10,1l-dihydro-5,10-imino-[5H]-dibenzo (a,d) cycloheptene d1 A mixture of 1.55 g of the product of Step C, 15 ml of ethylene glycol and 0.7 ml of hydrazine hydrate was heated at 100C for 1 hour and after adding 1.25 g of Water was added thereto and the mixture was extracted with ether. The ether phase was washed with water, dried over magnesium sulfate and distilled to dryness under reduced pressure. The residue was added to ml of ether and the mixture was vacuum filtered. The precipitate was washed with isopropyl ether and 4 g of the product was dissolved in 120 ml of hot ether. The mixture was filtered and the filtrate was concentrated to ml. Crystallization was effected overnight at room temperature and the precipitate was recovered by vacuum filtration, was washed with ether and dried to obtain 3 g of 10,11-dihydro5,10-imino- [5H]-dibenzo (a,d) cycloheptene d1 melting at 120C.

Analysis: C H N 207.26

Calculated:

71C 86.92 Found: 87.1

EXAMPLE 2 A current of ammonia was bubbled through a solution of 100 mg of 5-bromo-10,1 1-dihydro-[5H]- dibenzo (a,d) cycloheptene-10,1l-dione in 60 m1 of tetrahydrofuran for 7 hours at room temperature and then the mixture was distilled to dryness under reduced pressure. The residue was taken up in 5 ml of methylene chloride and the mixture was filtered. The filtrate was evaporated to dryness under reduced pressure and the residue was empasted with ether, vacuum filtered and dried to obtain 78 mg of lO-amino-l0,1 l-dihydro- 5,lO-imino-[5H]-dibenzo (a,d) cycloheptene-l l-one d1.

A solution of 100 mg of the said product in 1.5 ml of N hydrochloric acid was stirred for minutes at room temperature and was made alkaline by ammonium hydroxide addition. The mixture was extracted with methylene chloride and the organic phase was washed with water, dried over magnesium sulfate and distilled to dryness under reduced pressure. The residue was empasted with ether, vacuum filtered and dried to obtain 90 mg of 10-hydroxy-l0,11-dihydro-5,10-imino- [5H]-dibenzo (a,d) cycloheptene-1 l-one d1 melting at 212C.

EXAMPLE 3 10 g of 5-bromo-10,1l-dihydro-[5HJ-dibenzo (a,d) cycloheptene-10,1 l-dione was added to 250 ml of ammonia cooled to 40C and then stirred for 1 hour at 31 40C. The ammonia was distilled off and after adding 100 ml of 5 N hydrochloric acid thereto, the mixture was heated at 60-65C for 30 minutes. The mixture was cooled, made alkaline with'addition of l 10 m1 of ammonium hydroxide and extracted with methylene chloride. The organic phase was washed with water, dried over magnesium sulfate and distilled to dryness under reduced pressure. The residue was crystallized from ether, vacuum filtered and dried to obtain 7.4 g of 10-hydroxy-10,l1-dihydro-5,lO-imino-[5H]dibenzo (a,d) cycloheptene-1 l-one d1 melting at 214C.

EXAMPLE 4 A mixture of 1.5 g of ll-hydroxy-l0,ll-dihydro- 5,10-imino-[5H]-dibenzo (a,d) cycloheptene d1 cis, 60 ml of benzene and 3 g of silver silicate was refluxed with stirring for 45 minutes and then 1.5 g of silver silicate were added and reflux was continued for another hour. The mixture was filtered hot and the filter was washed with methylene chloride. The combined filtrates were washed with 2N hydrochloric acid and the acid phase was made alkaline with sodium hydroxide. The mixture was extracted with methylene chloride and the organic phase was dried over magnesium sulfate and distilled to dryness under reduced pressure. The residue was chromatographed over silica gel and eluted with a -5 mixture of chloroform-methanol to obtain 780 mg of 10,1l-dihydro-S,l0-imino-[5Hldibenzo (a,d) cycloheptene-1 l-one d1 melting at C identical to that of Example 1.

EXAMPLE 5 The process of Step 8 of Example 1 was repeated but instead of chromatography of the final product, the product was crystallized from ether to obtain 1.2 g of raw product consisting of 10,11-dihydro-5,10-imino- [5H]dibenzo (a,d) cycloheptene d1 and its 1 1 hydroxylated derivative melting at C and C. The mixture was chromatographed over silica gel and was eluted with 92.5 7.5 chloroform-methanol mixture. The residue was crystallized from ether to obtain 10,11dihydro-5,l0-imino[5Hl-dibenzo (a,d) cycloheptene dl melting at 120C and identical to the product of Step D in Example 1.

EXAMPLE 6 12-(2'-hydroxyethyl)-10,1 l-dihydro-S,10-imin0-[5H]- dibenzo (a,d) cycloheptene d1 A mixture of 2.5 g of 10,1l-dihydro-5,l0-imino- [5H]-dibenzo (a,d) cycloheptene d1, 25 m1 of ethanol, 2.5 g of potassium carbonate and 2 ml of monochlorohydrin of glycol was refluxed for 1 hour under a nitrogen atmosphere and 0.5 ml of monochlorohydrin of glycol were added thereto. After 2 hours of reflux, another 0.5 ml of monochlorohydrin of glycol was added and the mixture was refluxed for another hour for a total of 4 hours. After cooling, the reaction mixture was added to water and extracted with methylene chloride. The organic phase was washed with 2N hydrochloric acid and the acid phase was made alkaline by addition of sodium hydroxide. The mixture was extracted with ether and the ether phase was washed with water, dried over magnesium sulfate and distilled to dryness. The residue was washed with ether and dried to obtain 2 g of 12-(2-hydroxyethyl)-10,1l-dihydro- 5,10-imino-[5H]-dibenzo (a,d) cycloheptene d1 which after crystallization from isopropylether occurred as a colorless solid melting at 105C and then 1 16C.

Analysis: C H NO: molecular weight 251.31

Calculated: /(C 31,24 71H 6.82 ZN 5.57 Found: 81.3 6.9 5.4

EXAMPLE 7 12-acetonyll 0,1 l-dihydro-S,10-imino-[5H]-dibenzo (a,d) cycloheptene d1 A mixture of 2 g of 10,1 l-dihydro-5,10-imino- [5H]dibenzo (a,d) cycloheptene d1, 20 ml of ethanol, 2.5 g of potassium carbonate and 1.5 m1 of chloroacetone was refluxed under a nitrogen atmosphere and after 2 hours of reflux, 0.5 ml of chloroacetone were added and again .after another 2 hours of reflux, 0.5 ml

of chloroacetone was added. The mixture was refluxed for 2 more hours (total of 6 hours) and after cooling, water was added to the reaction mixture. The mixture was extracted with ether and the ether phase 'was washed with 2N hydrochloric acid. The acid phase was made alkaline by addition of sodium hydroxide and was extracted with ether. The ether phase was washed with water, was treated with activated carbon, was filtered, dried over magnesium sulfate and distilled to dryness. The residue was chromatographed over silica gel and was eluted with a 91 chloroform-methanol mixture. The product was crystallized from isopropyl ether and then ether to obtain 1.52 g of l2-acetonyl-1 0,l ldihydro5,10-imino-[5H1-dibenzo (a,d) cycloheptene d1 melting at 128-130C.

Analysis: C H NO; molecular weight 263.32

Calculated: 92C 82.10 7(H 6.51 71N 5.32 Found: 81.7 6.5 r 5.2

EXAMPLE 8 12-(o-nitrophenoxycarbonyl)-10,1 l-dihydro-5,1O- imino-[5H]-dibenzo (a,d) cycloheptene dl A mixture of 2.25 g of 10,1l-dihydro-5,-l-imino- [H]-dibenzo (a,d) cycloheptene d1, 5 ml of hexamethylphosphotriamide and 5 ml of benzene was formed under a nitrogen atmosphere and a solution of 2.46 g of o-nitrophenyl chloroformate in 5 ml of benzene was added thereto at room temperature. The mixture was refluxed for 2 hours and then distilledto dryness under reduced pressure. The residue was added to 25 ml of water and the mixture was extracted with methylene chloride. The organic phase was washed with 2N hydrochloric acid, with water, with an aqueous 10% sodium carbonate solution and finally with water, dried over magnesium sulfate and distilled to dryness. The residue was crystallized from ether to obtain 3.2 g of 12-(o'nitrophenoxycarbonyly10. 1 l-dihydro-5,10.- imino-[5H]-dibenzo' (a,d) cycloheptene d1 melting at 140C.

Analysis: C H N O molecular weight 372.37

Calculated: 71C 70.95 "/(H 4.33 71N 7.52 Found: 71.1 4.5 7.2

EXAMPLE 9 12-dimethylphosphorosomethyl-10,1 1-dihydro-5,10- imino-[SHl-dibenzo (a,d) cycloheptene dl A mixture of 2.25 g of 10,1l-dihydro-5,10-imino- [5H]-dibenzo (a,d) cycloheptene d1, 30 ml of toluene and 5.4 g of dimethylchloromethylphosphinoxide [prepared by process of King et a1. lnorg. Chem., Vol. 4( 1965), p. l98]was refluxed under a nitrogen atmosphere and ml of toluene were distilled off and maintaining reflux for 4 hours. The toluene was evaporated under reduced pressure and 50 ml of water and a few drops of sodium hydroxide were added thereto. The mixture was extractedwith methylene chloride and the organic phase was washed with water, dried over magnesium sulfate and distilled to dryness. Theresidue was chromatographed over silica gel and eluted with 9 -1 chloroform-methanol mixture to obtain 2.2 g of' 1 2- I dimethylphosphorosomethy11 0.1 l-dihydro-S ,10-

12 imino-[5H]-dibenzo (a,d) cycloheptene dl melting at Analysis: C H NOP; molecular weight 297.37

Calculated: /(C 72.69 71H 6.78 /(N 4.71 Found: 72.4 6.9 5.1

EXAMPLE l0 12-acetyll 0,1 1-dihydro-5,10-imino-[5Hl-dibenzo (a,d) cycloheptene d1 4 ml of acetic acid anhydride were added under a nitrogen atmosphere to a mixture of 2 g of 10,1 1- dihydro-S,l0-imino-[5Hl-dibenzo (a,d) cycloheptene d1 and 6 ml of pyridine cooled to 0C and the mixture was stirred for 1 hour at room temperature. 20 ml of water were added thereto and the mixture was stirred for 30 minutes. The mixture was extracted with methylene chloride and theorganic phase was washed with 2N hydrochloric acid, then with water, dried over magnesium sulfate and distilled to dryness. The residue was dissolved in a refluxing mixture of 40 ml of ether and ml of methylene chloride and the mixture was conc'entrat'ed to the beginning of crystallization. The mixture stood overnight and was vacuum filtered. The precipitate was washed with ether and dried under reduced pressure to obtain 1.8 g of l2-acetyl-10,l 1- dihydro-S,l0-imino-[5H]-dibenzo (a,d) cycloheptene d1 melting at 188C.

Analysis: C H NO: molecular weight 249.30

'Calculatcd:

12-(2'-dimethylaminoethyl)-10,1 l-dihydro-5,10- imino-[5H]-dibenzo (a,d) cycloheptene dl A mixture of 500 mg of 10,] l-dihydro-5,l0imino- [5H]-dibenzo (a,d) cycloheptene dl, lml of hexamethylphosphotriamide and 0.35 ml of 2- dirnethylaminoethyl chloride was heated at C with stirring for 4 hours and after cooling the mixture, 30 ml of methylene chloride were added thereto. The mixture was extracted with N hydrochloric acid and the acid phase was made alkaline with sodium hydroxide and extracted with ether. The ether phase was washed with water, dried over magnesium sulfate and distilled to dryness under reduced pressure. The residue was chromatographed over silica gel and eluted with a l-l chloroform-methanol mixture to obtain 270 mg of 12-(2'- dimethylaminoethy1)-l0,1 l-dihydro-S, 10-imino-[5H1- dibenzo (a,d) cycloheptene d1 in the form of an amorphous product.

Analysis: C I-1 19 molecular weight 278.39

C alculatcd:

71C 81.97 71H 7.97 71N 1006 Found: 82.0 8.2 9.9

U.V. Spectrum (ethanol):

1% lnflex. towards 227 nm E 320 1cm 1 1% lnflcx. towards 257 nm E 27 1cm 1% ln'flex. towards 262 nm E 37 12-( 3 '-dimethylam'inopropyl l 0,] l-dihydro-5,10-

imino-[5H]-d ibenzo (a,d) cycloheptene dl A mixture of so'o m cf 10,1l-dihydro5,l-imino- [SHJ-dibenzo (a,d) cycloheptene dl, ml of hexamethylphosphotriamide, 500 mg of potassium carbonate and 2 ml of 3 -d,irnethylaminopropyl chloride was heated at 105C for 1 hour and then 0.5 ml of 3- dimethylaminopropyl chloride was added and heating was continued for 30minutes. After cooling, the mixture was pouredv into .-water. and .was extracted with methylene chloride. The organic phase was washed with 2N hydrochloric acid, then with water and the acid phase was made alkaline with sodium hydroxide and extracted with ether. The ether phase was washed with water, dried over magnesium sulfate and evaporated to dryness to obtain 440 mg of 12-(3'- dimethylaminopropyl)-10,1 l-dihydro-5 l O-imino- [5H]-dil5enzo (a,d) cyclohep tene d] which when crystallized from pentane melted at 74C.

Analysis: c H N molecular weight 292.41 I

Calculated: %c 82.14 7.11 8.27;, 7: 9.58 Found: 81.9 s1 v 9.3

EXAMPLE .13

19 ml of toluene containing 20% phosgene. were added to a mixture of 1.8 g of l0,ll-dihydro-5 ,l0- imino-[5H]-dibenzo (a,d) cycloheptene d1, 20 ml of toluene and 0.7 ml of trie t'hylamine cooled to 0C and the mixture was stirred for minutues at room temperature and filtered. The filter was washed with toluene and the filtrate was evaporated to dryness under reduced pressure. The'residue was taken up in m] of benzene and the solution was evaporated to dryness to obtain 2.3 g of l2-chlorocarbonyl-l0,ll dihydro-5,10- imino-[5H]-dibenzo (a,d)cycloh e'ptene dl melting at 139l40C (calculated %Cl 13.14 Found 12.9).

The 2.3 g of product were dissolved in 30 ml of tetrahydrofuran and a current of ammonia was bubbled therethrough for 8 hours at-room temperature while adding a few ml of tetrahydrofuran to maintaina constant volume of 30 ml. After purging with nitrogen, the mixture was extracted with methylene chloride and the organic phase was'washed with water, dried over magnesium sulfate and distilled to dryness under reduced pressure. The residue was washed withe ther and dried to obtain 1.52 g of 12-carbamoyl-l0,l l-dihydro-5,l0- imino-[5H]-dibenzo (a,d) cycloheptene d1 melting at 193C. i

Analysis: C l-l N O; molecular weight 250.29

Calculated: 71c 76.77 "/(H 5.64 m 11.19 Found: 76.6 5.7 11.3

EXAMPLE l4 IZ-dimethylaminoacetyll 0,1 l-dihydro-5. 1 O-imino- [5H]-dibenzo (a,d) cycloheptene dl STEP: A l2-chloroacetyl-l0,l l-dihydro-5.lO-imino- [SHJ-dibenzo (a,d) cycloheptene d1 7 1 ml of monochloroacetyl chloride was added to a solution of 500 mg of 10.1l-dihydro-S,l0-imino-[5H]- dibenzo (a,d) cycloheptene dl in 5 ml of methylene chloride and after stirring for l8 hours at room temperature, the mixture was poured into water and was extracted with methylene chloride. The organic phase was washed with N sodium hydroxide, dried over magnesium sulfate and distilled to dryness under reduced pressure The residue was crystallized from ether to obtain 550 mg of l2-chloroacetyl-10,l 1-dihydro-5,l0- imino-[5H]-dibenzo (a,d) cycloheptene dl melting at Analysis: C H CINO; molecular weight 283.75

Calculated:

'/'N 4.93 Found: 5 0

Calculated:

"/(C 78.05 72H 6.90 '7N 9.57 Found: 77.9 6.7 9.7

EXAMPLE l5 12-methyl-l0,l l-dihydro-5,lO-imino-[SHl-dibenzo (a,d) cycloheptene dl STEP A: lO-Bromo-10,l l-dihydro-[SHl-dibenzo (a,d)

cycloheptene-l l-one A solution of 1.34 ml of bromine in 10 ml of carbon tetrachloride was added to a solution of 5 g of 10,] 1- dihydro -[.5H]-dibenzo (a,d) cycloheptene-ll-one in ml of carbontetrachloride cooled to 0C and after stirring for 30 minutes at room temperature, the insolubles were filtered off. The filtrate was distilled to dryness under reduced pressure to obtain 6.6 g of raw product which was crystallized from methanol to obtain l0-bromo-lO,l1-dihydro-[5H]-dibenzo (a,d) cycloheptene-l l-one melting at 8284C. The product was identical to that described by Rigaudy et a] [Bull. Soc. Chim., 1959, p. 638]. 7 STEP B: 5,10-dibromo-l0,ll-dihydro-[Sl-lI-dibenzo (a,d) cycloheptene-l l-one A solution of 900 mg of the product of Step A in 9 ml of carbon tetrachloride was cooled to 5C and with irradiation (hv) 0.22 ml of bromine dissolved in 4 ml of carbon tetrachloride was added thereto. The mixture was stirred for 7 hours while permitting the interior temperature to rise to 50C and excess reactant was removed with a current of nitrogen to obtain a solution of 5,10-dibromo-10,l l-dihydro-[5H]-dibenzo (a,d) cycloheptene-l l-one which was used as .is for the next step. STEP C: l2-methyl-10,1l-dihydro-5,l0-imino-[5H]- dibenzo (a,d) cycloheptene-l l-one dl A ml of a solution of methylamine in methylene chloride (titrating: 31 g/liter) was added to the solution of Step B and after stirring for 30 minutes, 25 ml of water were added thereto. The mixture was extracted with methylene chloride and the organic phase was washed with water, dried over magnesium sulfate and evaporated to dryness under reduced pressure. The residue was chromatographed over silica gel and eluted with ,a 73 benzene-ethyl acetate mixture. The residue was empasted with isopropyl ether to obtain 220 mg of 12- methyl-l0,l1-dihydro-5,lO-imino-[SHl-dibenzo (a,d cycloheptene-l l-one dl melting at 90C. STEP D: 12-methyl-l0,l 1-dihydro-5,10-imino-[5H]- dibenzo (a,d) cycloheptene dl A mixture of 5 g of l2-methyl-l0,1 1-dihydro-5,10- imino-[5H]-dibenzo (a,d) cycloheptene-1 l-one dl, 50 ml of ethyleneglycol and 2 ml of hydrazine hydrate was heated to l105C for 1 /2 hours and after the addition of 3.75 g of potassium hydroxide pellets, the mixture was heated for 3 hours at l65-l 70C. After cooling, 100 ml of water were added thereto and the mixture was extracted with ether. The ether phase was washed with water, dried over magnesium sulfate and distilled to dryness. The residue was chromatographed over silica gel and eluted with a 955, chloroformmethanol mixture. The residue was dissolved in 40 ml of hot pentane and filtered and concentrated to 10 ml. Crystallization was effected overnight at room temperature and the mixture was vacuum filtered. The crystals were washed with iced pentane and dried and crystallized from pentane to obtain 2.5 g of 12-methyl-l0,l 1- dihydro-S,10-imino-[H]-dibenzo (a,d) cycloheptene d1 melting at 78C. a

Analysis: C H N; molecular weight 221.29

Calculated: (AC 86.84 Al -1 6.83 VIN 6.33

Found; 87.] i 6.7 6.6

EXAMPLE 16 12-methyl-10,l l-dihydro-5,l0-imino-[5H]-dibenzo (a,d) cycloheptene d1 iodomethylate 1 ml of methyl iodide in 5 ml of ether were added under nitrogen atmosphere to a solution of 2.2 g of 12- methyl -10,l1-dihydro-5,lO-imino-[5H]-dibenzo (a,d) cycloheptene d1 in 30 ml of ether and after stirring 2 hours at room temperature, another 0.5 ml of methyl iodide was added. The mixture was sitrred over night at room temperature and was .vacuum filtered. The product recovered was washed with ether, crystallized from methanol and dried to obtain 2.05 of 12.-methyl- 10,1l-dihydro-5,IO-imino-[SHJ-dibenzo (a,d) cycloheptene d1 iodomethylate melting at 305306C. Concentration of the mother liquor gave a second crop of 0.26 g of the product.

Analysis: C H Nl; molecular weight 363.23

Calculated: 71C 5621 71H 4.99 '/IN 3.85 /11 34.94 Found: 56.0 4.9 3.9 34.7

EXAMPLE l7 l2-carbethoxy- 1 0,1 1-dihydro-5. 1 0-imino-[5-H 1- dibenzo (a,d) cycloheptene dl A mixture of 2 g of l2-methyl-l0,l l-dihydro-5,l0- imino-[SHl-dibenzo (a,d) cycloheptene dl, 40 ml of benzene and 3 ml of ethyl chloroformate was refluxed under a nitrogen atmosphere for 6 hours and then was distilled to dryness under reduced pressure. The residue was taken up in 200 ml of e ther and the ether phase was washed with 2N hydrochloric acid and then water. dried over magnesium sulfate and distilled'to dryness under reduced pressure. The residue was washed with ether and dried to obtain 1.9 g of l2-carbethoxy-l0,1 l'- dihydro-5,10-imino-[5H] dibenzo (a,d) cycloheptene d1. After crystallization from'ether, it melted at 1 113C.

Analysis: ,,.H,,No molecular weight 279.32

Calculated: Found: 772 6.0 5.3

EXAMPLE 18 10,1 l-dihydro-S,10-imino[5H]-dibenzo (a,d)

' cycloheptene d1 EXAMPLE 19 12-al1yl-10,1 l-dihydro- 5, l 0-imino-[ 5H]-diben zo cycloheptene d1 First 2.5 g of 10,11-dihydro-5,l0-imino-[5H]- dibenzo (a,d) cycloheptene d1 and then 1.25 g of silver oxide were added to 25 ml of chloroform and after cooling to 0C, 1.5 ml of allyl bromidewere added. The mixture was stirred for 2 hours at 0C and then was filtered. The filtrate was concentrated to dryness under reduced pressure and the residue was chromatographed over silica gel and eluted with a 9-1 chloroform-methanol mixture. The product was crystallized from pentane to obtain 1.8 g of 12-allyl- 10,1 l-dihydro- 5,10-imino-[5HJ-dibenzo (a,d) cycloheptene d1. An-

other crystallization from pentane resulted in a product melting at C, then 114C. I 1

Analysis: C H N; molecular weight 247.32

Calculated: Found:

EXAMPLE 20 l2-propargyl-l0,1 l-dihydro-5,l-imino-[5H]-dibenzo (a,d) cycloheptene d1 A mixture of g of 10,11-dihydro-5,l0-imino-[5H1- dibenzo (a,d) cycloheptene d1, 50 ml of benzene. 2.5

g of sodium bicarbonate and 2.5 ml of propargyl bromide was refluxed under nitrogen for 1% hours and after cooling, the mixture was filtered. The filtrate was Calculated: 7(C 88.13 71H 6.16 '72N 5.71 Found: 88.4 6.1 5.9

EXAMPLE 21 l2-ethyl-l0,1 l-dihydro-5,l0-imino-[51-11-dibenzo (a,d) cycloheptene dl A mixture of 4 g of 10,1l-dihydro-5,10-imino-[5H]- dibenzo (a,d) cycloheptene d1, 25 ml of chloroform, 2 g of silver oxide and 1.7 ml of ethyl iodide was stirred for 3 hours at room temperature and after the addition of another 0.35 ml of ethyl iodide, the mixture was stirred for 3 hours. Another 0.35 ml of ethyl iodide and 0.5 g of silver oxide were added and the mixture was stirred over night at room temperature. The mixture was filtered and the filtrate was concentrated to dryness. The residue was taken up in 100 ml of methylene chloride and the organic phase was washed with 2N hydrochloric acid. The acid filtrate was made alkaline with cold sodium hydroxide and was extracted with ether. The ether phase was washed with water, dried over magnesium sulfate and distilled to dryness. The residue was crystallized from pentane to obtain 2.8 g of l2-ethyll 0,1 l-dihydro-5 ,1 O-imino-[51-11-dibenzo (a,d) cycloheptene dl melting at about 84 C.

Analysis: C H N; molecular weight 235.31

Calculated: 71C 36.77 71H 7.28 7(N 5.95 Found: 86.6 7.2 6.0

EXAMPLE 22 12-n-buty1- l 0,1 l-dihydro-5,10-imino-[5H1-dibenzo (a,d) cycloheptene d1 and its hydrochloride A mixture of 3.5 of 10,1l-dihydro-5,10-imino-[51-1]- dibenzo (a,d) cycloheptene d1, 3.5 g of potassium carbonate and 35 m1 of acetone was prepared under a nitrogen atmosphere at room temperature and after the addition of 2.3 ml of n-butyl iodide, the mixture was stirred for 7 hours while adding 3 times 0.3 ml of butyl iodide. The mixture was filtered and the filtrate was evaporated to dryness under reduced pressure. The residue was extracted with N hydrochloric acid and the acid aqueous phase was washed with ether and made alkaline with sodium hydroxide. The mixture was extracted with methylene chloride and the organic phase was washed with water,-dried over magnesium sulfate and distilled to dryness to obtain 3.6 g of raw product. The latter was chromatographed over silica gel to obtain 3.5 g of l2-n-butyl-l0,l l-dihdryo-5,l0-imino- [5H]-dibenzo (a,d) cycloheptene d1 in the form of an oil. The oil was dissolved in 20 ml of ethyl acetate and ethyl acetate saturated with hydrochloric acid was added thereto. The precipitate crystallized from methylene chloride to obtain 2.4 g of the hydrochloride of the product melting at 260C.

Analysisz-C H ClN; molecular weight 299.84

Calculated: /(C 76.10 "/rH 7.40 "/(N 4.67 /rCl 11.83 Found: 76.1 7.3 4.8 12.1

EXAMPLE 23 12-benzyl-10,l l-dihydro-S,l0-imino-[5H]-dibenzo (a,d) cycloheptene dl A mixture of 3 g of 10,1l-dihydro-5,10-imino-[5H]- dibenzo (a,d) cycloheptene d1, 3 g of potassium carbonate, 30 ml of ethanol and 2.1 ml of benzyl bromide under nitrogen was stirred for 1V2 hours at room temperature and then the ethanol was distilled under reduced pressure. The residue was taken up in ether and the ether phase was extracted with 2N hydrochloric acid. The acid phase was made alkaline with sodium hydroxide and was extracted with ether. The ether phase was washed with water, dried over magnesium sulfate and distilled to dryness under reduced pressure to obtain 4 g of an oil which was crystallized from pentane to obtain 3.8 g of 12-benzyl-l0,l l-dihydro-5,10- imino-[5H]-dibenzo (a,d) cycloheptene d1 which melted at 90-92C after crystallization from isopropyl ether.

Analysis: C l-l N; molecular weight 297.38

Calculated: Found:

EXAMPLE 24 A mixture of 4 g of 10,11-dihydro-5,lO-imino-[51-1]- dibenzo (a,d) cycloheptene d1, 40 ml of acetone, 4 g of potassium carbonate and 2 ml of n-propyl iodide under nitrogen stood for 1 hour at room temperature and then in 4 hours, 4 doses of 0.5 ml of n-propyl iodide were added thereto. The mixture was filtered and the acetone was distilled off under reduced pressure. The raw product was taken up in 200 m1 of methylene chloride and the latter was extracted with 2N hydrochloric acid. The acid phase was made alkaline with sodium hydroxide and was then extracted with ether. The ether phase was washed with water, dried over magnesium sulfate and distilled to dryness to obtain 4.1 g of raw product. The latter was crystallized from pentane to obtain 3 g of l2-n-propyl-l0,1 l-dihydro-5,l0-imino- [51-1]-dibenzo (a,d) cycloheptene d1 melting at C.

Analysis: C H N; molecular weight 249.34

EXAMPLE 25 12-( methylaminoacetyl l 0,1 1-dihydro-5,l0-imino- [H l-dibenzo (a,d) cycloheptene d1 ml of monomethylamine in methylene chloride (titrating 167 g/liter) were added under a nitrogen atmosphere to 5 g of l2-chloroacetyl-l0,l l-dihydro- 5,l0-imino-[5H]-dibenzo (a,d) cycloheptene d1 in 50 ml of methylene chloride and after stirring for 2' hours at room temperature, excess monomethylamine was distilled off under reduced pressure. The residue was taken up in methylene chloride and the solution was washed with water, dried over magnesium sulfate and distilled to dryness under reduced pressure. The recovered oil was added to 100 ml of hot ether and the solution was treated with activated carbon, filtered and distilled to dryness under reduced pressure. The residue was chromatographed over silica gel and eluted with a 55 chloroform-methanol mixture to obtain 3.35 g of l2-(methylaminoacetyl)-10,1l-dihydr0-5,l0-imino- [SH]-dibenzo (a,d) cycloheptene dl as an amorphous solid.

Analysis: C H N O; molecular weight 278.34

Calculated: 53

(a,d) cycloheptene d] and its fumarate A mixture of 3.35 g of 8-chlorol2-methyl-l0,l1- dihydro-S.l0-imino-[5H]-dibenzo (a,d) cycloheptene -l l-one d1 (prepared by process of Steps A to C of Example but starting from 8-chloro-l0,ll-dihydro- [Sill-dibenzo (a,d) cycloheptene-ll-one) melting at 108C, 35 ml of ethyleneglycol and 1.3 ml of hydrazine hydrate under a nitrogen atmosphere was heated at 115C for 1% hours and then 2.55 g of potassium hydroxide pellets were added. The mixture was heated at 175C for 2 hours and after cooling, 100 ml of water were added. The mixture was extracted with methylene chloride and the organic phase was washed with water, dried over magnesium sulfate and concentrated to dryness under reduced pressure to obtain 3.5 g of 'raw product. The latter was chromatographed over silica gel and eluted with a 91 chloroform-methanol mixture to obtain 2.35 g of 8chloro-l2-methyl-l0,l l-dihydro- 5,l0-imino-[5H]-dibenzo (a,d) cycloheptene dl. The product was dissolved in ml of ethyl acetate, and then 1 g of furmaric acid in 20 ml of methanol was added thereto. The mixture was concentrated unde'r'a slight pressure and crystallization was effected. The mixture was vacuum filtered and the precipitate was washed with ethyl acetate and dried under reduced pressure to obtain 3.1 g of furmarate of the said'8- chloro compound melting at l48150C.

Analysis: C H ClNO molecular weight 371.80

9iCl 9.54

Calculated: Found:

EXAMPLE 27 (a,d) cycloheptene d1 A mixture of 4 g of l2-(2-hydroxyethyl)-l0,l 1- dihydro-SJO-imino-[SHJ-dibenzo (a,d) cycloheptene d1 and 40- ml of thionyl chloride was refluxed under a nitrogen atmosphere for 1 hour and then excess thionyl chloride was distilled off under reduced pressure. 60 ml of benzene were added and the mixture was distilled to dryness under reduced pressure. The residue was taken up in 200 ml of methylene chloride and the solution was made alkaline with 20 ml of triethylamine. The mixture was extracted with methylene chloride and the organic phase was washed with water, dried over magnesium sulfate and distilled to dryness under reduced pressure. The residue was taken up in ether, vacuum filtered and recrystallized from ether to obtain 2.7 g of 12-(2'-ch1oroethyl)-10,1 l-dihydro-5,l0-imino-[5H]- dibenzo (a,d) cycloheptene dl melting at 1 10C.

Analysis: C H ClN; molecular weight 269.75

Calculated: /(C 75.68 71H 5.98 7zCl 13.15 71N 5.19 Found: 75.7 6.1 13.4 5.5

EXAMPLE 28 1 2-( 2-methylaminoethy1)- 10,1 l-dihydro-S, IO-imino- [SHl-dibenzo (a,d) cycloheptene dl .100 mlof condensed monomethylamine were added to a 150 ml autoclave and 3.5 g of 12-(2'-chloroethyl)- 10.1 l-dihydro-5,l0-imino-[5H1-dibenz0 (a,d) cycloheptene d1 were added thereto. The mixture was heated for 24 hours at 95C with stirring and after cooling, excess monomethylamine was distilled off. The residue was added to methylene chloride and the solution was washed with water, dried over magnesium sulfate and concentrated to dryness under reduced pressure to obtain 3.3 g of raw product. The latter was chromatographed over silica gel and eluted with a -30-5 chloroformmethanol-triethylamine mixture to obtain 2.8 g of product. The product was taken up in 100 ml of refluxing ether and the solution was filtered and distilled to dryness to obtain 2.4 g of l2(2'-methylaminoethyl)- 10,1 l-dihydro-5,l0-imino-[5H]-dibenzo (a,d) cycloheptene d1 melting at 4850C.

Analysis: C H- N; molecular weight 264.36

Calculated: 71C 81.78 71H 7.63 /rN 10.60 Found: 81.6 7.7 10.3

EXAMPLE 29 l2-(2-dimethylaminoethyl)-10,l l-dihydro-5,10- imino-[5H1-dibenzo (a,d) cycloheptene d1 and its fumarate 3.9 g of l2-(2-chloroethyl)-10,l 1-dihydro-5,l0- imino-[SHl-dibenzo (a,d) cycloheptene d] and 100 ml of dimethylamine were added with agitation at 0C to a K50 ml autoclave and after heating at C for 15 hours, the mixture was cooled and dimethylamine was distilled at room temperature. The residue was taken 21 up in methylene chloride and the organic solution was washed with water, dried over magnesium sulfate and distilled to dryness under reduced pressure to obtain 3.8 g of raw product. The latter was chromatographed with "2N hydrochloric acid and the acid extract was made alkaline with sodium hydroxide. The mixture was extracted with ether and the ether phase was washed withwater, dried over magnesium sulfate and distilled over silica gel. and eluted with a 5 chloroform- 5 to dryness under reduced pressure to obtain 3.1 g of methanol mixture to obtain 2.8 g of 12(2'- raw product The. latter was dissolved in 100 ml of redimethylaminoethyl)-10,l l-dihydro-5,lO-imino-[5Hlfluxing ether and the solution was treated with actidibenZO yCloheptene dl as an oil. The oil was disvated carbon, filtered and concentrated. The crystals solved in 30 ml of ethyl acetate and a solution of 1.27 formed were recovered by vacuum filtration and were goffumaric acid in 20 ml of methanol was added dropwashed with ether to obtain 2.6 g of l2-(2- wise. Then 20 ml of ethyl acetate were added and the aminoethyl)-10,l l-dihydro-5,lO-imino-[5H]-dibenzo mixture was concentrated to 20 ml. The mixture was ,d) y l h d1 l i at 82 83C vacuum filtered to obtain 4 g of product which was Analysis; ;-'m' 5 weight 25033 crystallized from an ethyl acetate-methanol mixture to obtain 3.1 g of the fumarate of the dimethylaminoethyl product melting at 180C Calculated: 1c 81.56 41-1 7.25 "/(N 11.19

Analysis: C H N O molecular weight 394.45 Fmmd: 8L5

Calculated: 71C 70.03 71H 6.64 7(N 7.10 PHARMACOLOGICAL STUDY Found: 69.9 6.7 6.9

A. Amphetamine Toxicity The test was effected on group of 10 female mice EXAMPLE 3O weighing between 18 and 22 g kept at 27C for the dul2-(2"aminoethyl)-l0,l l-dihydro-5,lO-imino-[5H]- ration of the test. The test products were intraperidibenzo tioneally administered in different doses in a volume of 0.01 ml /g of mouse. One hour later, the mice received (ad) cycloheptene d1 an injection of 15 mg/kg of a solution of] .5 mg of am- STEP A: l2-(2"phthalimidoethyl)-10,1 l-dihydrophetamine per ml of physiological serum. The mortality 5,10-imino-[5Hl-dibenzo (a,d) cycloheptene dl 4 hours after the amphetamine injection was deter- A mixture of 4 g of l2-(2-chloroethyl)-l0,l lmined and the results were expressed as a ratio of numdihydro-S,lO-imino-[5H]-dibenzo (a,d) cycloheptene ber of'dead animals to'number of starting animals. The d1, 20 ml of dimethylformamide and 2.9 g of potassium DA dose. the dose which reduced by half the amphetphthalimide was heated with stirring under a nitrogen amine deaths, was determined and the results are reatmosphere for 1 A1 hours and after cooling the mixture, ported in Table l.

TABLE 1 Dosage l Product Controls ZOOy/Kg SOOy/Kg 1 mg/Kg 2 mg/Kg 5 mg/Kg l0 mg/Kg 20 mg/Kg mg/Kg Example 15 10/10 lO/lO 8/10 6/10 H10 ()/10' 0/10 Examples 1 and 18 9/10 9/10 9/10 10/10 5/10 Exam le 6 10/10 3/10 9/10 3/10 0/10 Example 7 8/10 2/10 0/10 0 10 0/10 Example 21 10/10 10/10 6/11) 0/10 0 10 Example 20 10/10 9/10 9/10 7/10 1/10 Example 24 6/10 10/10 9/10 3/10 Example 26 10/10 10/10 10/10 10/10 1/9 Example 27 8/10 10/10 8/10 2/10 50 ml of water were added. The precipitate formed was The results of Table 1 show that the products clearly recovered by vacuum filtration, was washed with water reduced the deaths provoked by amphethamine. particand taken up in 200 ml of ether. The organic solution 50 ularly l2-methyl-lO,l l-dihydro-5.l0-imino-[5H]- was washed with water, dried over magnesium sulfate dibenzo (a,d) cycloheptene dl which had a DA of l and distilled to dryness under reduced pressure. The mg/k residue was taken up in ether, vaccuum filtered and A ti l t Eff t dried under reduced pressure to obtain 4.7 g of l2-(2'- Th anticonvulsant activity of the compounds was phthalimidoethyl)-10,l l-dihydro-5,lO-imino-[SHldetermined on groups of 10 female mice with intraperidibenzo Cycloheptene dl melting at 150C The toneal administration of the test compounds in acid so- P was used as is for the next plution at different doses and the control group received S B1 lz-(z-aminoethyll'loxl y 'i only the solvent. One hour after the injection, the mice imino-l5Hl-dibenlo cycloheptene d] were perfused with a solution of pentamethyl- A mlXtUfe 0f g of -P y enetetrazol 1n phys1olog1cal serum ataconcentratlon of 10.1 l-dihydro-S.10-iminO-[5Hly 3 mg/ml. The perfusion was intraveinous at a rate of 1 heptene 47 ml of methanol and 1 ml of hydrazine ml per minute and in the course of the perfusion, the hydrate was refluxed with Stirring under a nitrogen progress of intoxication was characterized by the folmosphere for 1 hour and after cooling, the precipitate lowing 3 Criteria;

formed was recovered by vacuum filtration and was washed with methanol. The filtrate was distilled to dryness under reduced pressure and the residue was taken up in methylene chloride. The solution was extracted 0. Threshold of convulsant effect (myoclonia of the ears) b. Crisis of clonic convulsions 25' with l-isonico-thinoly-2-isopropyl-hydrazine l8 hours before the test which product caused the following symptoms: hypertonicity. agitation. crying, aggressiveness. salivation and exophthalmia. The aministration of The antidepressant activity was determined by antagonism exercised by the compounds against the depressant activity of reserpine and this effect was determined by ptosis of the eyelid test codified by Rubin {J. Pharm.

an antidepressant one hour before the DOPA injection 5 EXP-Th ta l- 120 5 P1 5] Th eyelid ptosis potentializes h intensity f h ffect5 test is used to make a quantitative evaluation of the Male mice weighing between 18 to 22 g received incondition of the animal. but the antagonism exercised traperitoneally 50 mg/kg of l-isonicotinoyl-2-isoproq ally agains he neuro depressive symptom of repyl-hydrazine and 18 hours later the test product intraserpine; immobility, adynamia. hypothermia. myosis, peritoneally in aqueous solution in increasing doses and I etc. The reading was effected every hour for 6 hours 1 hour later received an intraperitoneal injection of 50 after intraperitoneal injection of 1 mg/kg of reserpine mg/kg of DOPA. The different effects were evaluated to groups of rats who had one hour previously received l and 30 minutes after the DOPA injection and each intraperitoneally a variable dose of the test compounds. sympton was evaluated for each animal on a scale from The ptosis provoked by the reserpine injection was di- 0 to 3 and the evaluations for each dose was totaled. minished by the previous injection of the test com- The totals are reported in Table III as a percent of the pounds, all the more so at the elevated doses. The retotal of control animals. sults were expressed as a percentage ofprotection compared to controls which received only reserpine and are 7 reported in Table IV. TABLE The results of Table IV show that the dose that reduces by 5O 7: ptosis of the eyelid provoked by reser- DOSOS fldministeredin g pine (DA- is between 10 and mg/kg for com Product of l 2 5 10 2O 50 pounds to "L Example i 5 E. Potentiallzation of Sleeping Time 21 187% 175% 181% I The potentialization of sleeping time was determined 9 with a test using amytal [5'ethyl-5-isoamylbarbi turic 14 j 160% 1967, acid] in which groups of female mice weighing between 2? 17771 18 and 22 g were kept at 25 C for the duration of the I l m test. The test products were administered intraperit'oneally at different doses one hour'before intraveinous r 1 injection of 80 mg/kg of amytal and the sleeping time The results of Table III show that the compounds of was noted which is the time while=the reflex'of straightvthe invention possess an important potentialization of ening in the mice was negative. The average sleeping DOPA activlty. r r 3 time for each group was determined in minutes and the D. Antidepressant Activity results are reported in Table V.

' i TABLE IV Products /z Protection 2 10 2o nt'g/Kg' mg/Kg mg/Kg Mg/Kg l2-(ZK-methylaminoethyh- 10,1 l-dihydro-ilO-iminol() 43 84 ISHI-dibenzo (a,d) cyclohcptenc (compound 1) l2 2-dimcthylaminoethyl 10,1 l-dihydro-S. l 0-imino- ISHI-dibenzo (a.d) cyclo- 9 40 39 66 heptenc (fumaratc) (compound II) l2-(2-aminoethyl)-l0 l ldihydro-S. l (l-imino l 5H 18 38 69 74 dibenzo (a.d) cycloheptenc (compound lll) TABLE V Doses administered Controls 0.5 l 2 5 1O 20 5O mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg nig/Kg mg/Kg l2-propargyll0.l l- 7 dihydro-5.10-imino- [SHjl-dibenlo (a,d) cycloheptene 35.0 41.8 46.5 49.4 64.9

l2-n1eth \'l-l0.l l' dihy- A dro-SAO-imino-[SHI- dibenzo (a.d) cycloheptene 27.9 33.9 32.9 30.6 42.9 78.6

l2-allyl-l0.l l-dihydro -5.l()-imino-[5Hl-dihcnzo (a.d) cycloheptenc 40.8 37.1 65.1 71.7

l2-ethyll 0.1 l -dihydro- 5. l O-imino-l 5H l dibenzo Doses administered (a.d) cycloheptene dibenzo (a,d) cyclohcptcnc IZ-n-propyl-IOJ ldihydro-S l tl-iniino' [H I-dibcnzo (and) cyclohcptcnc 8-chlorol Z-mcthyl- 10.1 l-dihydro-S. l imino-I 5H I-dibcnzo (a.d) cycloheptene (fumaratc) Table V shows that the test products potentialize the I sleeping time provoked by amytal. i a I 2 r 1 JR F. Acute Toxlcity v a g The acute toxicity was determined on groups of Swiss 2 mg/Kg 32.4 as! 42:2 I 65.] l()3.7

mice weighing 18 to 22 g and the test products were administered intraperitoneallyin increasing doses and the animals were kept under observation for a week. The DL.-,n dose was then determined and is reported in droxyalkyl of one to six carbon atoms.

50 mg/Kg wherein R is selected from the group consisting of hydrogen. alkyl ofone to six carbon atoms,- monohy- 'mon'ohaloalkyl of one to six carbon atoms, lower alkenyl of two' to six Table VI.

carbon atoms and lower alkynylof two to SIX carbon atoms. and R, and R are individually selected from the TABLE V] group consisting of hydrogen and halogen and the nontoxic, pharmaceutically acceptable acid addition salts Product of L m in thereof.

Example mg/Kg 40 2. A compound of claim 1 wherein R is selected from 8 |0Q() the group consisting of hydrogen, methyl, ethyl, n- I propyl and hydroxyethyl. I9 5 3. A compound of claim 1 selected from the group 6 35 I consisting of 10,1l-dihydro-5,l0-imino-[5H1-dibenzo g (a,d) cycloheptene and its non-toxic, pharmaceutically l7 moo acceptable acid addition salts. :2 '4. A compound of claim 1 selected from the group land 18 :56 consisting of 12-methyl-l0,l l-dihydro-5,l0-imino- I [5H]-dib enzo (a,d) cycloheptene and its non-toxic, =b pharmaceutically acceptable acid addition salts. 36 5. A compound of claim 1 selected from the group 5; 2 consisting of l2-n-propyl-l0,l l-dihydro-5,lO-imino- .38 [SI-ll-dibenzo (a,d) cycloheptene and its non-toxic, 6 pharmaceutically acceptable acid addition salts.

We claim:

1. A compound of the formula consisting of l2-ethyl-l0,l l-dihydro-S, dibenzo (a,d) cycloheptene and its non l2-hydroxyethyll 0,]

ceutically acceptable acid addition salts. I

7. A compound of claim 1 selectedfrom the group 6. A compound of claim I selected from the group l0-imino-[5H]- -toxic, pharmal-dihydro-S ,10-

imino-[SHl-dibenzo (a,d) cyclohepteneand its nontoxic. pharmaceutically acceptable acid addition salts.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTIUN Page l of q P tent No. 756 Dated July 975 LUCIEN NEDELEC and DANIEL FRECHET Inventor(s) It is certified that error appears in the above-identified patent D and that said Letters Patent are hereby corrected as shown below:

Col. Line Under Abstract [57] Cannot see Formula I 0 XR O "cH -1 should be UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Page 2 of L1 Patent NO. 3,892,756 Dat d July 1i 197's Invent-OHS) LUCIN NEDELEC and DANIEL FRECHET It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Col. Line 0 O [/X A X 2 l 65 "CH -P should be -CH l X 2 X r 2 O 2 60 same as above 3 5 Cannot see formula II (CH Oh 6 UNITED STATES PATENT OFFICE a Pa e of CERTIFICAEE ()F (,ORRELTION O 3 Patent No. 3 ,d2, 6 Dated July .L, 19/

Inventor) LUCIEN NEDELEC and DANIEL FRECHET h It is certified that error appears in the above'identified patent and that said Letters Patent are hereby corrected as shown below:

Col. Line 5 2O Cannot see formual VII (CH Hal 6 5 Cannot see formula IX 

1. A COMPOUND OF THE FORMULA
 2. A compound of claim 1 wherein R is selected from the group consisting of hydrogen, methyl, ethyl, n-propyl and hydroxyethyl.
 3. A compound of claim 1 selected from the group consisting of 10,11-dihydro-5,10-imino-(5H)-dibenzo (a,d) cycloheptene and its non-toxic, pharmaceutically acceptable acid addition salts.
 4. A compound of claim 1 selected from the group consisting of 12-methyl-10,11-dihydro-5,10-imino-(5H)-dibenzo (a,d) cycloheptene and its non-toxic, pharmaceutically acceptable acid addition salts.
 5. A compound of claim 1 selected from the group consisting of 12-n-propyl-10,11-dihydro-5,10-imino-(5H)-dibenzo (a,d) cycloheptene and its non-toxic, pharmaceutically acceptable acid addition salts.
 6. A compound of claim 1 selected from the group consisting of 12-ethyl-10,11-dihydro-5,10-imino-(5H)-dibenzo (a,d) cycloheptene and its non-toxic, pharmaceutically acceptable acid addition salts.
 7. A compound of claim 1 selected from the group consisting of 12-hydroxyethyl-10,11-dihydro-5,10-imino-(5H)-dibenzo (a,d) cycloheptene and its non-toxic, pharmaceutically acceptable acid addition salts. 